I cut the index finger on my right hand yesterday so I took it pretty easy tonight, I finally finished the bottom of the eccentric goblet. It took me a couple of days to figure out how to get it done. Eventually I decided to make a long vacuum drum. I used a 3" ABS pipe with a reducer on the end to form the vacuum chamber. I had to cut a slot in the reducer to accept the stem and then had to tape over the slot and around the joint between the pipe and the reducer in order to make it air tight.
The finished piece, better showing the offset between the axis and how the ring is captured
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